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Subject[PATCH 1/2] pinctrl: add sleep mode management for hogs
Date
From: Julien Delacou <julien.delacou@stericsson.com>

This fix allows handling sleep mode for hogged
pins in pinctrl. It provides functions to set pins
to sleep/default configurations according to their
current state from the individual pinctrl drivers.

Signed-off-by: Julien Delacou <julien.delacou@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/pinctrl/core.c | 35 ++++++++++++++++++++++++++++++++---
drivers/pinctrl/core.h | 4 ++++
include/linux/pinctrl/pinctrl.h | 2 ++
3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5cdee86..f9c50bb 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1055,6 +1055,28 @@ void pinctrl_unregister_map(struct pinctrl_map const *map)
}
}

+/**
+ * pinctrl_force_sleep() - turn a given controller device into sleep state
+ * @pctldev: pin controller device
+ */
+int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
+{
+ if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
+ return pinctrl_select_state(pctldev->p, pctldev->hog_sleep);
+ return 0;
+}
+
+/**
+ * pinctrl_force_default() - turn a given controller device into default state
+ * @pctldev: pin controller device
+ */
+int pinctrl_force_default(struct pinctrl_dev *pctldev)
+{
+ if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
+ return pinctrl_select_state(pctldev->p, pctldev->hog_default);
+ return 0;
+}
+
#ifdef CONFIG_DEBUG_FS

static int pinctrl_pins_show(struct seq_file *s, void *what)
@@ -1500,16 +1522,23 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,

pctldev->p = pinctrl_get_locked(pctldev->dev);
if (!IS_ERR(pctldev->p)) {
- struct pinctrl_state *s =
+ pctldev->hog_default =
pinctrl_lookup_state_locked(pctldev->p,
PINCTRL_STATE_DEFAULT);
- if (IS_ERR(s)) {
+ if (IS_ERR(pctldev->hog_default)) {
dev_dbg(dev, "failed to lookup the default state\n");
} else {
- if (pinctrl_select_state_locked(pctldev->p, s))
+ if (pinctrl_select_state_locked(pctldev->p,
+ pctldev->hog_default))
dev_err(dev,
"failed to select default state\n");
}
+
+ pctldev->hog_sleep =
+ pinctrl_lookup_state_locked(pctldev->p,
+ PINCTRL_STATE_SLEEP);
+ if (IS_ERR(pctldev->hog_sleep))
+ dev_dbg(dev, "failed to lookup the sleep state\n");
}

mutex_unlock(&pinctrl_mutex);
diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h
index 12f5694..b5bbb09 100644
--- a/drivers/pinctrl/core.h
+++ b/drivers/pinctrl/core.h
@@ -30,6 +30,8 @@ struct pinctrl_gpio_range;
* @driver_data: driver data for drivers registering to the pin controller
* subsystem
* @p: result of pinctrl_get() for this device
+ * @hog_default: default state for pins hogged by this device
+ * @hog_sleep: sleep state for pins hogged by this device
* @device_root: debugfs root for this device
*/
struct pinctrl_dev {
@@ -41,6 +43,8 @@ struct pinctrl_dev {
struct module *owner;
void *driver_data;
struct pinctrl *p;
+ struct pinctrl_state *hog_default;
+ struct pinctrl_state *hog_sleep;
#ifdef CONFIG_DEBUG_FS
struct dentry *device_root;
#endif
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 04d6700..814cb56 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -155,6 +155,8 @@ struct pinctrl_dev *of_pinctrl_get(struct device_node *np)

extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
+extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
+extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
#else

struct pinctrl_dev;
--
1.7.11.3


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